This is a Sources Sought notice for information and planning purposes only, not a solicitation. The contractor would supply liquid helium in 100- and 250-liter dewars on an as-needed basis for NIST in Boulder, Colorado. Responses must be submitted by 2:00 PM MT on July 2, 2026. No budget amount is specified. The NAICS code is 325120 with a 1,200-employee size standard.